Section insulator



gep t. 2-, 1924.

W. SCHAAKE SECTION INSULATOR Filed Sent. 17. 1920 \P INVENTOR 271E222 idzid/k Y WITNESSES:

"' TOR'NEY Patented Sept. 2, 1924.

1 UNITED STATES PATENT OFFICE.

VIILLIAM SCHAAKE, OF PIT'lSBUR(I%1-I, PENNSYLVANIA, ASSIGNOB TO -WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

SECTION INSULATOB.

Application filed September To all whom it may concern- Be it known that 1, WILLIAM SCI-IAAKE, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Section Insulators, of which the following is a specification.

My inventionrelates to trolley-conductor devices and particularly to devices known as section breaks for separating an overhead trolley-conductor system into sections.

The object of my invention is to provide a device of the above indicated character that shall be of substantially minimum weight and a minimum number of parts, thereby rendering it economical toimuiufacture, and that shall be simple and durable in construction and eifective in operation.

In practicing my invention, 1 provide conductor-receiving end or terminal members that together comprise no more material than is present in an intermediately suspended trolley-conchlctor splice member of usual form with the exception of laterally extending lugs of substantially minimum material for the support of insulating side plates. The latter are constructed of a composite insulating material to provide minimum weight and maximum mechanical and elec trical strengths. A trolley runner member, a supporting member and spacing or positioning members, included in the structure, are also so constructed as to permit the structure to be of substantially minimum Weight for given mechanical and electrical stresses.

Figure 1 of the accompanying drawings is a side elevational view of a section insulator embodying my invention, with portions broken away for clearness.

Fig. 2 is a plan view of the device shown in Fig. 1.

Fig. 3 is a transverse sectional view taken along the line II1-1H of Fig. 1, and

Fig. 4 is a transverse sectional view taken along the line IVIV of Fig. 1.

My device comprises, in general, conductor-receiving end or terminal members 1, insulating side bars or plates 2 connecting the members 1. an insulating runner member 23 disposed between the members 2 and the terminal members 1 in alinement with trolley conductors 4 and 5, and a central supporting member 6.

The terminal members 1 comprise curved 17, 1920. Serial No. 410,868.

tubular portions 7 for the reception of the trolley conductors 1 and and are provided with screws 8 for clamping the conductors therein. The members 1, also, have web portions 9, disposed beneath the tubular portion 7, and end portions 10 that partially embrace the conductors 4 and 5 and are so shaped as to therewith constitute a smooth trolley running surface. Bolts 12 extend through oppositely-disposed transversely projecting lugs 11, on the terminal members 1, and through the side plates 2 to secure the latter in position.

The plates 2 are preferably constructed of a composite insulating material, such as superposed layers of duck or other fabric that is impregnrted with a phenolic condensation product for a binder. These plates are of relatively thin flat sheet formation and may be cut from standard sheet material. This construction permits the device to be of substantially minimum weight, of great mechanical strength and economy of manufacture and of great durability. Further, the insulating material thereof is unaffected by wide temperature changes, moisture, oils, weak acids and alkalis. The runner member 8 that may be constructed of similar materials is supported in alinement with the web portions 9 of the members 1 by transverse bolts 13 that extend therethrough and through the side members 2 and are embraced on either side of the member 3 by spacing sleeves 14. Renewable arcing members 15 of strap construction and of substantially inverted U- shape are fitted over reduced sections of the web portions 9, and are held in position by cotter pins 16 that extend through registering openings in the members 15 and the portions 9. The insulating runner member 3 and the portions 9 are closely engaged in end-to-end relation and with the arcing members 15 have similar rounded lower surfaces co-operating to constitute an unbroken trolley contact surface.

The supporting member 6 comprises a relatively thin transverse bar portion 17 hav ing openings 18 at its outer ends, for the reception of guy wires 19, and depending lugs 20 embracing the outer surfaces of the members 2 and secured to the latter by means of bolts 21. A swivel nut 22 or other means may be secured to the member 6 for attachment to a mine-roof stud or other device (not shown).

All of the metal and insulating parts are of relatively light construction to form a structure of extremely light weight that is, at the same time, effective, durable and economical;

While I have shown and described a particular form of my invention, changes may be effected therein Without departing from the spirit and scope thereof, as set forth in the appended claims. 7

I claim as my invention 1. A section-break device for trolley conductors comprising three parallel relatively thin spaced plates of insulating material joined, adjacent to their ends, to conductorreceiving members, the central insulating member constituting a trolley runner, transverse bolts extending through all of the insulating members, and sleeves on the bolts between the central and outer insulating members.

2. A trolley-conductor section-break device comprising a terminal member having a trolley-runner portion, a trolley-runner member in alignment therewith and an independently removable arcing member therebetween.

3. A trolley-conductor section-break device comprising a terminal member having a trolley-runner portion, a trolley-runner member in alignment therewith and an independently removable arcing member fitted between and conforming to said portion and to said trolley-runner member to effect a uniform trolley-runner surface.

4. A trolley-conductor section-break d6? vice comprising a plurality of parallel spaced plates joined, adjacent to their ends, to conductorr-receiving members, one of saidplates cons ituti g a trolleyunne mem e1i,.t n verse members extending'through said plates and spacing members to maintain the plates subscribed my name this 7th day of September 1920. I

WILLIAM SCHAAK-E. 

